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PRESENT REEF ACCUMULATION Tropical water conditions . Water conditions favourable to the growth of reefs exist in tropical or near - tropical surface waters . Regional differences may result from the presence or absence of upwelling ...
An internal skeleton is usually present in the form of ingrowths of the integument , known as apodemes , which serve as points for the insertion of muscles . In decapods , especially crabs , the apodemes unite to form an elaborate ...
Subclass Cirripedia ( barnacles ) Upper Silurian ( 420,000,000 to 395,000,000 years ago ) to present , worldwide , marine to brackish water . Sedentary or parasitic ; head usually reduced and abdomen lost .
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review